WO1998046708A1 - Use of surfactants with low molecular weight as agents for improving the filterability in lubricants - Google Patents
Use of surfactants with low molecular weight as agents for improving the filterability in lubricants Download PDFInfo
- Publication number
- WO1998046708A1 WO1998046708A1 PCT/FR1998/000659 FR9800659W WO9846708A1 WO 1998046708 A1 WO1998046708 A1 WO 1998046708A1 FR 9800659 W FR9800659 W FR 9800659W WO 9846708 A1 WO9846708 A1 WO 9846708A1
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- WO
- WIPO (PCT)
- Prior art keywords
- filterability
- lubricating fluid
- improving
- carbon atoms
- oil
- Prior art date
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- C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
- C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M133/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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- C10M129/16—Ethers
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/042—Metal salts thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/045—Metal containing thio derivatives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/12—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions obtained by phosphorisation of organic compounds, e.g. with PxSy, PxSyHal or PxOy
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2225/00—Organic macromolecular compounds containing phosphorus as ingredients in lubricant compositions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2225/00—Organic macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2225/02—Macromolecular compounds from phosphorus-containg monomers, obtained by reactions involving only carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2010/00—Metal present as such or in compounds
- C10N2010/04—Groups 2 or 12
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/08—Hydraulic fluids, e.g. brake-fluids
Definitions
- the present invention relates to lubricating fluids having improved filterability characteristics, and effective additives to improve the filterability characteristics of lubricating fluids such as hydraulic oils.
- the present invention relates more particularly to lubricating fluids and additives comprising an effective amount of a filterability improving agent which comprises at least one polar group and at least one lipophilic chain having 14 to 24 carbon atoms.
- the inventors have discovered that it is possible to improve the filterability properties of lubricating oils by using filterability improving agents comprising at least one polar group and at least one lipophilic chain having a particular length. More advantageously, when using the compounds described below, the filterability performance is improved but this improvement obtained is generally not detrimental for the main performance criteria and can even have positive effects in certain cases.
- the present invention relates generally to a lubricating fluid, in particular a hydraulic oil, comprising:
- Z represents a polar group containing one or more substituents chosen from: a) phosphoric esters; b) amides; c) ethers; d) amino alcohols; e) ethoxylated amines; f) mixtures thereof.
- the number of these polar group substituents can vary from 1 to 30 but usually a number of 3 to 5 polar substituents is preferred.
- this chain usually consists of a saturated or unsaturated hydrocarbyl chain having 14 to 24 and preferably 17 to 19 carbon atoms .
- the hydrocarbyl chain can be straight or branched, although straight chains are usually preferred.
- this lipophilic chain is preferably unsubstituted, it is possible to incorporate substituents or to insert heteroatoms or various groups in the chain provided that these insertions or substituents have no significant effect on the total polarity of the molecule.
- the present invention also relates to the use of the agents for improving the filterability described in the present specification for improving the filterability of oils, in particular hydraulic oils.
- the present invention also relates to a process for the production of a hydraulic fluid with improved filterability, which comprises mixing the following constituents: a) a dominant quantity of an oil of viscosity suitable for lubrication; and b) from 0.03% to 0.06% of a filterability improving agent, corresponding to the following formula
- RZ wherein Z represents a polar group containing one or more substituents selected from the group consisting of a) phosphoric esters; b) amides; c) ethers; d) amino alcohols; e) ethoxylated amines; f) mixtures thereof, and R represents a lipophilic chain having 14 to 24 carbon atoms.
- a large group of filterability enhancing agents includes those in which the polar group Z contains one or more constituents selected from: a) phosphoric esters; b) fatty amides; c) polyethers; d) ethoxylated amines; e) their mixtures.
- Each member of this group can itself form, with the appropriate hydrocarbyl chain, independent subgroups of agents improving filterability falling within the scope of the present invention.
- a subgroup of specific phosphoric esters includes phosphoric esters corresponding to the following formula: O - X
- X represents H or R and at least one of the symbols X represents R, and R represents a saturated or unsaturated hydrocarbyl chain which may comprise ether groups.
- the hydrocarbyl chain has 14 to 24 carbon atoms, advantageously 14 to 24 carbon atoms and preferably 17 to 19 carbon atoms.
- R represents a group [CH 3 - CH 2 ) n - CH 2 -f O - CH 2 - CH 2 ) - 3 ].
- An example of such phosphoric esters consists of RHODAFAC PA35 commercially available, supplied by Rhône Poulenc.
- a subgroup of polyethers comprises compounds corresponding to the formula:
- R represents a hydrocarbyl chain having 14 to 24 carbon atoms and in which, more advantageously, R represents a group C 5 H 31 , the polar group Z being represented by -0- (CH 2 -CH 2 0) x H.
- a preferred subgroup of ethoxylated amines includes ethoxylated amines comprising at least two ethoxy groups.
- a more preferred group includes ethoxylated amines corresponding to the following formula CH 2 CH 2 OH
- R represents a hydrocarbyl chain having 14 to 24 carbon atoms, and in particular an aliphatic chain C 18 H 35 .
- a preferred subgroup of unsubstituted fatty amides comprises compounds of the following formula:
- R represents a hydrocarbyl chain having 14 to 24 carbon atoms and preferably 17 to 19 carbon atoms.
- the concentration of the filterability improving agents described above must be adjusted so that the desired effect (improvement in the filterability characteristics of the oil) is obtained without being detrimental to the other performances resulting from the action of other additives which may be present in the oil composition. More particularly, it is considered that excessive concentrations of the compounds used in the context of the present invention may have harmful effects, in particular on the oxidation stability, the thermal stability and the hydrolysis stability of the oil. finished. For example, it turns out that high concentrations have negative effects on tests such as ASTM-D4310, ASTM-D943 and ASTM-D2619.
- the polar substituents of the agents improving the filterability have an effect. preferential dispersant on solid particles, which makes it possible to avoid the formation of aggregates of certain dimensions and, consequently, clogging of the filters. It also appears that the polar substituents of the filterability enhancing agents of the present invention exhibit some type of inhibition of the adverse effects of viscosity index improving agents and pour point lowering agents also through preferential interactions with solid particles.
- Filterability improvers of the present invention are particularly useful for improving the filterability characteristics of lubricating oils and, preferably, hydraulic oils. They are effective regardless of the presence or absence of an agent improving the viscosity index in the oil.
- the improvement in filterability can be obtained for considerably different viscosity intervals.
- an improvement in filterability can be obtained for qualities ranging from ISO VG 15 to 150, preferably for qualities ranging from ISO VG 32 to 68.
- the AFNOR NFE 48691 filterability test comprises the following stages: - formulation of the oil incorporation of 0.2% by weight of water and mixture to form a storage emulsion at 70 ° C. for 72 hours , then storage at room temperature (24 hours) - filtration of 300 ml of the oil on a 0.8 mm Millipore filter at a pressure depending on the filtration speed measurement of the time required to filter 50, 100, 200 and 300 ml oil and calculation of the corresponding IFE values.
- the filterability indices calculated for the test oils containing filterability improving agents were significantly improved compared to reference formulations which do not include the filterability improving agents and, in fact, are close to the "ideal" filterability index which is equal to 1.
- the incorporation of low concentrations of the agents improving filterability used in the The present invention in additives generally does not appear to be harmful for other properties such as wear inhibition, oxidation stability or thermal stability or else the hydrolysis performance of hydraulic oils. This was measured using tests such as the FZG seizure test, the Denison and Vickers Vane tests and the piston pump tests and the Cincinnati Milacron thermal stability tests as well as the ASTM D943 and ATMD 4310 oxidation tests. and the ASTM D2619 hydrolysis stability test. As mentioned above, it has also been noted that some of the agents improving filterability can have an advantageous effect on thermal stability and oxidation performance.
- the basic lubricant can be chosen from hydraulic / transmission fluids, hydraulic fluids for brakes, fluids for power steering and fluids for tractors, the precise composition of which may vary slightly.
- the lubricating oils of the present invention comprise a dominant amount of an oil of lubricating viscosity.
- This oil can be any hydrocarbon-based lubricating oil or a synthetic base oil. It can be derived from synthetic or natural sources and it can be a paraffinic, naphthenic or asphalt base oil or consist of a mixture thereof.
- the oil of lubricating viscosity is prepared from a crude mineral oil by methods physical separation, such as distillation, deasphalting and dewaxing, or it can be prepared by chemical conversion, such as catalytic or non-catalytic hydrotreatment of mineral oil fractions, or by a combination of chemical separation processes and a chemical conversion; or it may consist of a basic synthetic hydrocarbon oil.
- the oil of viscosity suitable for lubrication has a kinematic viscosity of 5 to 220 cSt at 40 ° C.
- additives which are well known in the art may be present in the increased filterability hydraulic fluid of the present invention. These additives may include, for example, antioxidants, viscosity index improvers, detergents, rust inhibitors, demulsifiers, foam inhibitors, corrosion inhibitors, pour point lowering agents and d other antiwear agents. Examples of these additives are shown below:
- Antioxidants include sterically hindered alkylphenols such as 2,6-di-tertio-butylphenol, 2,6-di-tertio-butyl-p-cresol and 2,6-di-tertio-butyl-4- ( 2-octyl-3-propanoic) -phenol; N.N-di (alkylphenyl) amines; and alkylated phenylene diamines.
- alkylphenols such as 2,6-di-tertio-butylphenol, 2,6-di-tertio-butyl-p-cresol and 2,6-di-tertio-butyl-4- ( 2-octyl-3-propanoic) -phenol
- N.N-di (alkylphenyl) amines alkylated phenylene diamines.
- Viscosity index improvers include polymeric alkylmethacrylates and olefinic copolymers, such as an ethylene-propylene copolymer or a styrene-butadiene copolymer.
- Detergents include calcium alkylsalicylates, calcium alkylphenates and calcium alkarylsulfonates.
- Anti-rust additives include alkenyl succinic agents (short chains), their partial esters and their nitrogen derivatives; and synthetic alkarylsulfonates, such as metallic dinonyinaphthalenesulfonates.
- Demulsifiers include alkoxylated phenols and phenol-formaldehyde resins as well as synthetic alkylarylsulfonates, such as metallic dinonyinaphthalenesulfonates.
- Foaming inhibitors include polymers of alkyl methacrylate and polymers of dimethylsilicone.
- Corrosion inhibitors include 2,5-dimercapto-1, 3,4-thiadiazoles and their derivatives, mercaptobenzothiazoles, alkyltriazoles and benzotriazoles.
- APEs Pour Point Lowering Agents
- Antiwear agents zinc alkyldithiophosphates (preferred), aryl phosphates and phosphites, sulphide esters and phosphosulphide compounds, metallic or ashless dithiocarbamates.
- the hydraulic fluidity with increased filterability of the present invention can be produced by mixing the oil of clean viscosity with the lubrication and the agent improving the filterability together with the other additives described above which may be present in the oil of clean viscosity lubrication.
- the constituents of this mixture can interact during the mixing operation by modifying the filterability improving agent and / or the other additives.
- the various preferential conditions indicated above apply both to lubricating fluids and to the process for the production of a hydraulic fluid as well as to the uses according to the present invention.
- COMPARATIVE EXAMPLE A formulation of basic additives containing functional amounts of zinc dithiophosphate, of a dithiocarbamate without ash, calcium-containing detergent, phenolic antioxidant, anti-rust additives, demulsifiers, foam inhibitor based on silicone polymer, were mixed so that the formulation of basic additives (XOIE 303J) represents 0.80% by weight of the finished oil formulation.
- the finished oil formulation had a kinematic viscosity at 40 ° C equal to about 46 cSt.
- COMPARATIVE EXAMPLE A The base additive formulation was mixed in a refined base oil with a solvent "A”, with the addition of an APE additive (of PMA type) at a dose of 0.2% by weight.
- EXAMPLE 1 An amount of 0.05% by weight of a commercial phosphoric ester "P1" (Rhodafac PA35 from Rhône Poulenc) was added to the finished oil of Comparative Example A.
- EXAMPLE 2 An amount of 0.05% by weight of a commercial phosphoric ester "P2" (CRODAFOS N3A from Croda) was added to the finished oil of Comparative Example A.
- EXAMPLE 3 An amount of 0.05% by weight of a commercial phosphoric ester "P3" (CRODAFOS N5A from Croda) was added to the finished oil of Comparative Example A.
- EXAMPLE 4 An amount of 0.03% by weight of a commercial fatty amide “OL” (CRODAMIDE O from Croda or Armeed O from Akzo) was added to the finished oil of Comparative Example A.
- COMPARATIVE EXAMPLE B The formulation of base additives was mixed in a refined base oil with a solvent "B”, with the addition of an APE additive (of PMA type) at a dose of 0.2% by weight.
- EXAMPLE 5 An amount of 0.05% by weight of a commercial phosphoric ester "P1" (Rhodafac P PA35 from Rhône Poulenc was added to the finished oil of Comparative Example B.
- EXAMPLE 6 An amount of 0.05% by weight of a commercial phosphoric ester "P2" (CRODAFOS N3A from Croda) was added to the finished oil of Comparative Example B.
- EXAMPLE 7 An amount of 0.05% by weight of a commercial phosphoric ester "P3" (CRODAFOS N5A from Croda) was added to the finished oil of Comparative Example B.
- EXAMPLE 8 An amount of 0.03% by weight of a commercial fatty amide "OL” (CRODAMIDE O from Croda or Armeed O from Akzo) was added to the finished oil of Comparative Example B.
- COMPARATIVE EXAMPLE C The formulation of base additives was mixed in a refined base oil with a solvent "C", with the addition of an APE additive (of PMA type) at a dose of 0.2% by weight and addition of an AIV additive (PMA type) at a dose of 4.65% by weight.
- EXAMPLE 9 An amount of 0.05% by weight of a commercial phosphoric ester "P1" (Rhodafac PA 35 from Rhône Poulenc) was added to the finished oil of Comparative Example C.
- EXAMPLE 10 An amount of 0.05% by weight of a commercial phosphoric ester "P2” (CRODAFOS N3A from Croda) was added to the finished oil of Comparative Example C.
- EXAMPLE 11 An amount of 0.05% by weight of a commercial phosphoric ester "P3" (CRODAFOS N5A from Croda) was added to the finished oil of Comparative Example C.
- EXAMPLE 12 An amount of 0.03% by weight of a commercial fatty amide "OL” (CRODAMIDE O from Croda or Armeed O from Akzo) was added to the finished oil of Comparative Example C.
- COMPARATIVE EXAMPLE D The formulation of base additives was mixed with a "specialty of base formulation" containing a certain quantity of AIV additive (of PMA type).
- EXAMPLE 13 An amount of 0.05% by weight of a commercial phosphoric ester "P1" (Rhodafac PA 35 from Rhône Poulenc) was added to the finished oil of Comparative Example D.
- EXAMPLE 14 An amount of 0.05% by weight of a commercial phosphoric ester "P2" (CRODAFOS N3A from Croda) was added to the finished oil of Comparative Example D.
- EXAMPLE 15 An amount of 0.05% by weight of a commercial phosphoric ester "P3" (CRODAFOS N5A from Croda) was added to the finished oil of Comparative Example D.
- EXAMPLE 16 An amount of 0.03% by weight of a commercial fatty amide “OL” (CRODAMIDE O from Croda or Armeed O from Akzo) was added to the finished oil of Comparative Example D.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98917285A EP0931126A1 (en) | 1997-04-11 | 1998-04-01 | Use of surfactants with low molecular weight as agents for improving the filterability in lubricants |
JP54354698A JP2002501558A (en) | 1997-04-11 | 1998-04-01 | Use of low molecular weight surfactants to improve filterability of hydraulic lubricating oils |
US09/209,674 US20020049144A1 (en) | 1997-04-11 | 1998-12-11 | Use of surfactants with low molecular weight for improving the filterability in hydraulic lubricants |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR97/04481 | 1997-04-11 | ||
FR9704481A FR2762005B1 (en) | 1997-04-11 | 1997-04-11 | USE OF LOW MOLECULAR WEIGHT SURFACTANTS AS FILTER-IMPROVING AGENTS IN HYDRAULIC LUBRICANTS |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1998046708A1 true WO1998046708A1 (en) | 1998-10-22 |
WO1998046708B1 WO1998046708B1 (en) | 1998-11-26 |
Family
ID=9505805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1998/000659 WO1998046708A1 (en) | 1997-04-11 | 1998-04-01 | Use of surfactants with low molecular weight as agents for improving the filterability in lubricants |
Country Status (6)
Country | Link |
---|---|
US (1) | US20020049144A1 (en) |
EP (1) | EP0931126A1 (en) |
JP (1) | JP2002501558A (en) |
CA (1) | CA2257877A1 (en) |
FR (1) | FR2762005B1 (en) |
WO (1) | WO1998046708A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1205535A1 (en) * | 1999-08-13 | 2002-05-15 | New Japan Chemical Co.,Ltd. | Clogging inhibitor for oil filters, method for inhibiting the clogging of oil filters and engine oil compositions containing the inhibitor |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004021778A1 (en) * | 2004-04-30 | 2005-12-08 | Rohmax Additives Gmbh | Use of polyalkyl (meth) acrylates in lubricating oil compositions |
WO2007001000A1 (en) | 2005-06-29 | 2007-01-04 | Nippon Oil Corporation | Base oil for hydraulic oil and hydraulic oil compositions |
CN107828480B (en) * | 2017-10-30 | 2020-12-25 | 江苏龙蟠科技股份有限公司 | High-performance synthetic power-assisted steering oil composition and preparation method thereof |
Citations (8)
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US3340191A (en) * | 1962-12-18 | 1967-09-05 | Rohm & Haas | Fuel and lubricant compositions |
US3796662A (en) * | 1972-02-17 | 1974-03-12 | Chevron Res | Extended life functional fluid |
US4101429A (en) * | 1977-07-21 | 1978-07-18 | Shell Oil Company | Lubricant compositions |
US4280916A (en) * | 1980-03-31 | 1981-07-28 | Shell Oil Company | Lubricant composition |
US5078893A (en) * | 1988-06-24 | 1992-01-07 | Exxon Chemical Patents Inc. | Synergistic combination of additives useful in power transmitting compositions |
EP0524783A1 (en) * | 1991-07-23 | 1993-01-27 | Oceanfloor Limited | Use of lubricating oil compositions |
EP0667389A2 (en) * | 1994-02-11 | 1995-08-16 | The Lubrizol Corporation | Metal free hydraulic fluid with amine salt |
EP0776964A1 (en) * | 1995-12-01 | 1997-06-04 | Ethyl Petroleum Additives Limited | Hydraulic fluids |
-
1997
- 1997-04-11 FR FR9704481A patent/FR2762005B1/en not_active Expired - Lifetime
-
1998
- 1998-04-01 EP EP98917285A patent/EP0931126A1/en not_active Withdrawn
- 1998-04-01 JP JP54354698A patent/JP2002501558A/en active Pending
- 1998-04-01 CA CA002257877A patent/CA2257877A1/en not_active Abandoned
- 1998-04-01 WO PCT/FR1998/000659 patent/WO1998046708A1/en not_active Application Discontinuation
- 1998-12-11 US US09/209,674 patent/US20020049144A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3340191A (en) * | 1962-12-18 | 1967-09-05 | Rohm & Haas | Fuel and lubricant compositions |
US3796662A (en) * | 1972-02-17 | 1974-03-12 | Chevron Res | Extended life functional fluid |
US4101429A (en) * | 1977-07-21 | 1978-07-18 | Shell Oil Company | Lubricant compositions |
US4280916A (en) * | 1980-03-31 | 1981-07-28 | Shell Oil Company | Lubricant composition |
US5078893A (en) * | 1988-06-24 | 1992-01-07 | Exxon Chemical Patents Inc. | Synergistic combination of additives useful in power transmitting compositions |
EP0524783A1 (en) * | 1991-07-23 | 1993-01-27 | Oceanfloor Limited | Use of lubricating oil compositions |
EP0667389A2 (en) * | 1994-02-11 | 1995-08-16 | The Lubrizol Corporation | Metal free hydraulic fluid with amine salt |
EP0776964A1 (en) * | 1995-12-01 | 1997-06-04 | Ethyl Petroleum Additives Limited | Hydraulic fluids |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1205535A1 (en) * | 1999-08-13 | 2002-05-15 | New Japan Chemical Co.,Ltd. | Clogging inhibitor for oil filters, method for inhibiting the clogging of oil filters and engine oil compositions containing the inhibitor |
EP1205535A4 (en) * | 1999-08-13 | 2006-10-18 | New Japan Chem Co Ltd | Clogging inhibitor for oil filters, method for inhibiting the clogging of oil filters and engine oil compositions containing the inhibitor |
Also Published As
Publication number | Publication date |
---|---|
JP2002501558A (en) | 2002-01-15 |
US20020049144A1 (en) | 2002-04-25 |
FR2762005B1 (en) | 2000-03-31 |
EP0931126A1 (en) | 1999-07-28 |
CA2257877A1 (en) | 1998-10-22 |
FR2762005A1 (en) | 1998-10-16 |
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